DESCRIPTION

The DS1834 Dual EconoResets monitors three vital system conditions: 5-volt supply, 3.3-volt supply, and an external override. First a precision temperature reference and comparator circuit monitor the status of the 5-volt supply and the 3.3-volt supply. When an out-of-tolerance condition is detected, an internal power-fail signal is generated which forces the reset of the affected supply to an active state.

FEATURES

■ 5V power-on reset

■ 3.3V power-on reset

■ Internal power is drawn from higher of either the 5VIN input or the 3.3VIN input

■ Excellent for systems designed to operate with dual power supplies

■ Asserts resets during power transients

■ Pushbutton reset input for system override

■ Maintains reset for 350 ms after VCC returns to an in-tolerance condition

■ Reduces need for discrete components

■ Precision temperature-compensated voltage reference and voltage sensor

■ 8-pin DIP, 8-pin SOIC, and 8-pin µ-SOP available

■ CMOS output for low current operation on the DS1834 and DS1834D

■ Operating temperature of -40°C to +85°C